2000-12-11 Fernando Nasser <fnasser@redhat.com>

[deliverable/binutils-gdb.git] / gdb / infrun.c

diff --git a/gdb/infrun.c b/gdb/infrun.c
index 57233a8f1b862598328df1014488630db2131c2f..01db98ca200c2f69d8b046ae1555dde849f8fad1 100644 (file)
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -84,6 +84,11 @@ void _initialize_infrun (void);
 int inferior_ignoring_startup_exec_events = 0;
 int inferior_ignoring_leading_exec_events = 0;
 
+/* When set, stop the 'step' command if we enter a function which has
+   no line number information.  The normal behavior is that we step
+   over such function.  */
+int step_stop_if_no_debug = 0;
+
 /* In asynchronous mode, but simulating synchronous execution. */
 
 int sync_execution = 0;
@@ -940,7 +945,7 @@ clear_proceed_status (void)
   step_range_start = 0;
   step_range_end = 0;
   step_frame_address = 0;
-  step_over_calls = -1;
+  step_over_calls = STEP_OVER_UNDEBUGGABLE;
   stop_after_trap = 0;
   stop_soon_quietly = 0;
   proceed_to_finish = 0;
@@ -2612,7 +2617,7 @@ handle_inferior_event (struct execution_control_state *ecs)
        loader dynamic symbol resolution code, we keep on single stepping
        until we exit the run time loader code and reach the callee's
        address.  */
-    if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
+    if (step_over_calls == STEP_OVER_UNDEBUGGABLE && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc))
       {
        CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc);
 
@@ -2733,7 +2738,7 @@ handle_inferior_event (struct execution_control_state *ecs)
       {
        /* It's a subroutine call.  */
 
-       if (step_over_calls == 0)
+       if (step_over_calls == STEP_OVER_NONE)
          {
            /* I presume that step_over_calls is only 0 when we're
               supposed to be stepping at the assembly language level
@@ -2744,7 +2749,7 @@ handle_inferior_event (struct execution_control_state *ecs)
            return;
          }
 
-       if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc))
+       if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc))
          {
            /* We're doing a "next".  */
 
@@ -2810,6 +2815,18 @@ handle_inferior_event (struct execution_control_state *ecs)
              return;
            }
        }
+
+       /* If we have no line number and the step-stop-if-no-debug
+          is set, we stop the step so that the user has a chance to
+          switch in assembly mode.  */
+       if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug)
+         {
+           stop_step = 1;
+           print_stop_reason (END_STEPPING_RANGE, 0);
+           stop_stepping (ecs);
+           return;
+         }
+
        step_over_function (ecs);
        keep_going (ecs);
        return;
@@ -3934,7 +3951,7 @@ struct inferior_status
   CORE_ADDR step_range_start;
   CORE_ADDR step_range_end;
   CORE_ADDR step_frame_address;
-  int step_over_calls;
+  enum step_over_calls_kind step_over_calls;
   CORE_ADDR step_resume_break_address;
   int stop_after_trap;
   int stop_soon_quietly;
@@ -4309,4 +4326,13 @@ step == scheduler locked during every single-step operation.\n\
 
   c->function.sfunc = set_schedlock_func;      /* traps on target vector */
   add_show_from_set (c, &showlist);
+
+  c = add_set_cmd ("step-mode", class_run,
+                  var_boolean, (char*) &step_stop_if_no_debug,
+"Set mode of the step operation. When set, doing a step over a\n\
+function without debug line information will stop at the first\n\
+instruction of that function. Otherwise, the function is skipped and\n\
+the step command stops at a different source line.",
+                       &setlist);
+  add_show_from_set (c, &showlist);
 }